Question

“Monkey’s puzzle” is a common name for
A. Araucaria imbricata
B. Cycas revoluta
C. Pinus longifolia
D. Gnetum gnemon

Answer 1

Monkey’s puzzle is the name of a tree which originates from Chile, South America. It is also known as Chile pine. The tree got its name Monkey Puzzle because of its unusual shape of the branches which can confuse a monkey if it decides to climb to the top. Since it has close resemblance to its ancestor species it is also known as a living fossil. The monkey puzzle tree is the national tree of Chile, South America.

Complete answer:
Option A Araucaria imbricata : Araucária imbricata also known as Araucária araucana is an evergreen tree growing to $1-1.5{\text{ }}m$ in diameter and $30-40\;m$ high. It is native to southern Chile and western Argentina. It is commonly known as the monkey puzzle tree or monkey tail tree.
Option A is correct.
Option B Cycas revoluta : Cycas revoluta is a species of gymnosperm belonging to the family Cycadaceae. It is native to southern Japan including the Ryukyu Islands. It's one of several species used to make sago, as well as a decorative plant. This tree is also called sago palm, king sago, sago cycad and Japanese sago palm.
Option B is incorrect.
Option C Pinus longifolia : Pinus longifolia belongs to the family Pinaceae. It is an ayurvedic medicinal plant used for the treatment of digestive disorders, fever, swelling and skin diseases. It is commonly found in India. In pharmacology it is used as antiseptic and stimulant diaphoretic. This tree is also called Chir pine and Sarala.
Option C is incorrect.
Option D Gnetum gnemon : It is a species of Gnetum native to southeast Asia and the western Pacific Ocean islands. It is commonly seen in Mizoram and Assam in India, Indonesia, Malaysia, Philippines and Fiji. This tree is known by different names such as gnetum, joint fir, two leafs, melinjo, belinjo, bago, and tulip.
Option D is incorrect.

Hence, Option A Araucaria imbricata is the correct answer.

Note:
The monkey puzzle tree is highly valued as timber due to its fungal resistance and durability properties. Woods from this tree have been used to make furniture, plywood, roofs and boat structures. It is grown in many households in Chile for its beautiful appearance. The brown seeds from this tree are edible and taste similar to pine nuts.